Ecology Ecological Succession 3

Question 1

Which of the following is an example of autogenic succession?

Accepted Answer

Vegetation changing a bog into a forest through peat accumulation

Answer

Autogenic succession is driven by the organisms within the community themselves, as when bog vegetation accumulates peat and gradually changes conditions until the bog becomes forest.

Question 2

In lake succession (hydrosere), what is the typical progression from an open water body to a terrestrial community?

Accepted Answer

Lake → marsh → shrubs → forest

Answer

Hydrosere succession typically proceeds from open water to aquatic plants, then marsh, then shrubs and trees as sediment accumulation raises the substrate above water level.

Question 3

Which factor most directly determines whether the climax community in a region is deciduous forest, grassland, or desert?

Accepted Answer

Climate, particularly temperature and precipitation patterns

Answer

Regional climate — especially long-term patterns of temperature and precipitation — is the primary determinant of the type of climax community that develops in a given area.

Question 4

The concept of 'relay floristics' in succession refers to:

Accepted Answer

Sequential replacement of species groups where each facilitates the next

Answer

Relay floristics describes how different groups of species sequentially replace one another during succession, with each group modifying conditions that facilitate the next group's establishment.

Question 5

Which of the following best explains why later successional species tend to be taller and longer-lived than early successional species?

Accepted Answer

Later species are adapted to compete for light in increasingly shaded environments

Answer

As succession proceeds, canopy closure increases shading, so species that can grow tall and tolerate or exploit low-light conditions gain competitive advantage over short-lived, sun-requiring pioneers.

Ecology Practice Test

Ecology Practice Test

Ecology Ecological Succession 3